1155531233 has 4 divisors (see below), whose sum is σ = 1168514820. Its totient is φ = 1142547648.

The previous prime is 1155531211. The next prime is 1155531239. The reversal of 1155531233 is 3321355511.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 440664064 + 714867169 = 20992^2 + 26737^2 .

It is a cyclic number.

It is not a de Polignac number, because 1155531233 - 2¹⁰ = 1155530209 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1155531196 and 1155531205.

It is not an unprimeable number, because it can be changed into a prime (1155531239) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6491660 + ... + 6491837.

It is an arithmetic number, because the mean of its divisors is an integer number (292128705).

Almost surely, 2^1155531233 is an apocalyptic number.

It is an amenable number.

1155531233 is a deficient number, since it is larger than the sum of its proper divisors (12983587).

1155531233 is an equidigital number, since it uses as much as digits as its factorization.

1155531233 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12983586.

The product of its digits is 6750, while the sum is 29.

The square root of 1155531233 is about 33993.1056686499. The cubic root of 1155531233 is about 1049.3665818339.

Adding to 1155531233 its reverse (3321355511), we get a palindrome (4476886744).

The spelling of 1155531233 in words is "one billion, one hundred fifty-five million, five hundred thirty-one thousand, two hundred thirty-three".